“In the past, bilinguals were looked down upon,” Professor of Psychology, Linguistics and Women’s Studies Judith F. Kroll said in a press statement. “Not only is bilingualism not bad for you, it may be really good. When you’re switching languages all the time it strengthens your mental muscle and your executive function becomes enhanced.”

Researchers performed two experiements on English and Spanish speakers to assess whether both languages were active in their minds at all times. In the first, subjects read 512 sentences in either English or Spanish, switching between the two every two sentences, and had to read cognates out load in red as quickly and accurately as possible. The subjects rarely tripped up. The linguists then performed the same experiment, one language at a time, with similar results.

“Bilinguals rarely say a word in the unintended language, which suggests that they have the ability to control the parallel activity of both languages and ultimately select the intended language without needing to consciously think about it,” the release says.